Do you have any kind of gizmo?
Someone else can link to a vid about wrapping around a screwdriver or something...
I highly recommend one of these coilmaster thingies.
You don't need a big fancy kit - even this is totally optional - but I found it made it much easier for me to get neat tidy coils. If you know you want 2.5mm diameter you can get just that one size at some places. Or get a kit with a few sizes.
EVERY online vape shop should have these just about. Or search "coil jig" or coilmaster...
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Here's a
tutorial how to use one - you can skip the first 4 minutes...